Saw-mill set-works



(No Model.) 2 Skmas---Sheetlf W. H. SNYDER.

SAW MILL SET WORKS.

Patented Aug. 28.1883.

ATTORNEYS.

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N. PETERS Pl'wilithognphnr. Washington. D C.

(No Moden) 2 sheets-sheen 2.

W. H. SNYDER.

SAW MILL SET WORKS. No. 284,081. Paterited Aug. 28, 1883..

A WITNESSES dwf. 60M

ATTORNEYS.

`, UNITED STATES PATENT EricE.

SAW-M ILL SET-WORKS..

SPECIFICATION forming part of Letters Patent No. 284,081, dated August 28, 1883,

Application filed May 3, 1883.

To all whom it may concern:

Be it known that I, VILLIAM H. SNYDER,

Y of Vaynesborough, in the county of Franklin and State of Pennsylvania, have invented a new and useful Improvement in Saw-Mill Head-Blocks; and I do hereby declare that the following is a full, clear, and eXact description of the same, reference being had to the accompanying drawings, forming part of this sp'ecification, in which- Figure 1 is a side elevation of my saw-mill lieadblock. Fig. 2 is a vertical transverse section of the same. Fig. 3 is a side elevation with the ratchet-wheel removed; and Fig. 4 is a perspective view, showing a modification of my invention, and showing the application thereof to a combined independent and simultaneous head-block.

My invention relates to an improvement in saw-mill head-blocks designed to enable the Sawyer to move the knees forward or backward without releasing his hold upon the han,- dlefrod and without any change in his position.

In the drawings, A represents the headblock upon which the log rests and on which the knees slide. Running through this headblock andthe corresponding parallel supports for the log is the longitudinal shaft B, which is provided with a pinion for each knee, which pinion engages with teeth upon the under side ofthe horizontal sections of the knees. y

C is the ratchetwheel, which is rigidly keyed upon the adjusting-shaft B, and which is made with short teeth having the same inclination upon both sides.

D is the adjusting-lever, which is mounted upon the shaft B, and is arranged to oscillate above the same. On the lever D, just above the ratchetwheel, is an offsetting-pin, a, upon which are hung two oppositely-working pawls, E F, either of which may alternately rest upon the periphery of the ratchet-wheel, but which pawls cannot occupythis position at the same time. At the upper end of the adjusting-lever D is the handle-rod G, which is jointed to a swiveling piece, b, journaled in the end of the lever. y This swiveling section has a short crank-arm, c, that is jointed to a rod, c, which lies parallelwith the adj usting-lever, and at its lower end is connected to a slotted sliding (No model.)

ratchet-wheel and throws the other pawl, F, out

by striking against the horn-like projection e2.

I is a detent, which is Vpivoted on a pin, g, on the head-block, and which detent is made with a weighted extension upon one side of its center, which normally holds the toothed end of the detent into engagement with the ratchet-wheel. When the pawl F is working to advance the log, the detent I engages with the ratchet-wheel to hold it to place while the pawl is moving back for a new hold, and when l the pawl F is thrown out and E thrown in to reversev the movement, the detent I, as a matter of course, must be thrown out of engagement with the ratchet-wheel. To permit this to be done by the same movement that brings pawl E into engagement, a lever7 J, Fig. 3, is fulcrumedat j, and one end is bent laterally and extended under the Weighted end ofthe detent, while the other end is allowed to rest beneath the end of the slide-plate H, so that when the slide-plate moves down to throw pawl Fout and bring pawl E into engagement the fsame movement causes lever- .I to be turned on its fulcrum and throw the detent I, away from the wheel. For effecting the change inthe position of the pawls and detent and reversing the feed, it will be seen that all that is necessary is simply to give the handle-rod a rotary turn about its own axis and continue the oscillation of the lever by alternately pushing and pulling the handie-rod.

K is a forked support offsetting from the working-lever, for holding up the handle-rod, and L is a curved bar with holes and pins, which latter may be adjusted in the holes to limit the length of the stroke of the lever.

In making use of my invention I may arrange it in connection with a simultaneously working head-block Vin which all of the knees arev adjusted equally and together from one IOO c 284.0811 t Y shaft; or I may use two independent shafts v having two independent ratchet-wheels thereon, juxtaposed so as to be operated by a common mechanism, but so arranged that one 5 ratchet-wheel, shaft, or head-block may be operated` to moveone end of a log without the other, so as to get the benefit of an angular cut. Such general arrangement of my devices for vcoacting with two independent ratchet wheels and shafts is shown in Fig. 4, in which the rods e are worked by independent rockshafts ff.

In the drawings I have shown the pawl F, 1 l

. the weighted detent I, and its releasing-lever kand also the detent I, constructed of several parallel similarly-acting pieces, as has been heretofore done to insure engagement with the ratchet-wheel; but this is not essential to my invention. v

In dening my invention with greater eX- Patent N o. 160,116, and I do not claim, broadly, the reversal of a pawl by the rotary axial adjustment ofthe handle-rod which connects `shafts bearingv independenttoothed wheels, and a vibrating lever carrying reversely-acting pawls for each wheel, of a handle-rod cony`nected to the lever, independent rock-shafts with the lever. This result has been heretofore attained 5 but the connection between the pawls and the handle-rod was a flexible cord or chain. I therefore restrict this partof my invention to a rigid sliding bar ,or connection, which acts upon the pawls with a positive bearing. This not only makes a more positive action, butenables me to throw either pawl in and the other out, or to stop the adjustment midway its range of movement and hold both pawls out. This is verydesirable 3 5, sometimes, especially in light saw-mills, where ing-rod e, for actuating the sliding bar H, and

actness, I would state that I am aware of theto save time the sawyer will sometimes pull back the head-block by hand.

Having thus described my invention, what I claim as new is- 1. The rigid sliding bar H, with laterally- 4o projecting pin, in combination with the reversely-acting pawls pivoted or jointed to the lever, the toothed wheel operated upon by said pawls, the vibrating lever, the connectmeans for vibrating the lever, substantially as shown and described.

t 2. The combination, with the toothed wheel,

.dle-rod connected to the lever, and aninileXible or rigid connection receiving its movement from thehandle-rod, and acting upon t the pawls and also upon the detent-lever with farsimultaneous and scribed.

. positive'action, as de- 3. The combination, with two independent ff arranged therein, and independent inleXible connection extending from the said rockshafts to the pawls, for reversing them, as dey scribed.

, WILLIAM H. SNYDER. Witnesses D. M. Gooi), Jr., SAML. HARFLICH. 

